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  #1  
Old 10-23-2009, 03:33 PM
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Join Date: Feb 2008
Location: tucson arizona
Posts: 33
c280 engine running rough

i have a 1994 c280. On a trip it started to miss about 100 miles after a fillup. When cold it runs fine until warm. Even when warm sometimes it runs ok after being off for 10 min. Seems to be getting worse, but still smooth when cold. Changed the fuel filter and plugs. Old plugs all looked normal. All cyls 150 psi warm. Car has 120,000 mi

recently replaced the OVP relay.

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Old 10-23-2009, 03:57 PM
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Join Date: Nov 2008
Location: Canada
Posts: 604
Has the engine harness ever been replaced? Any fault codes being stored?
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Old 10-23-2009, 09:35 PM
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Join Date: Feb 2008
Location: tucson arizona
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the harness is original. The wiring on the top of the engine to the injectors appears to not be brittle. I plan to have the codes run. Thx

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